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Proceedings of the semi-centennial anniversary of the Torrey botanical club, October 18, 19 and 20, 1917 - Torrey Botanical Club. (1918)

Proceedings of the United States National Museum - Smithsonian Institution (Smithsonian Institution Press, [etc.], 1901)

Progressus rei botanicae = Fortschritte der Botanik = Progrès de la botanique = Progress of botany - Association internationale des botanistes. (G. Fischer, 1907)

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Pronunciation of plant names - Garden Club of America. (Reproduced and printed by National Process Company], 1922)

Protected Landscapes: experience around the world. Prepared for the International Symposium on Protected Landscapes, Grange-over-Sands, England 5-10 October 1987 (1987)

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Pteridologist - British Pteridological Society. (The Society, 1987)

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Pteridologist - British Pteridological Society. (The Society, 1990)

Pteridologist - British Pteridological Society. (The Society, 2000)

Pteridologist - British Pteridological Society. (The Society, 2001)

Pteridologist - British Pteridological Society. (The Society, 2002)

Pteridologist - British Pteridological Society. (The Society, 2008)

Pteridologist - British Pteridological Society. (The Society, 2010)

Pteridologist - British Pteridological Society. (The Society, 2011)

Pteridologist - British Pteridological Society. (The Society, 2012)

Pteridologist - British Pteridological Society. (The Society, 2014)

Pteridologist - British Pteridological Society. (The Society, 2017)

Pteridologist - British Pteridological Society. (The Society, 2019)

Pteridophyta und Anthophyta - Wettstein, Richard, Ritter von Westersheim, 1863 -1931 (K.K. Hof- und Staatsdruckerei, 1908)

Pteridophyten - Christ, H. (Hermann), 1833 -1933 (Wilhelm Engelmann, 1896)

Ptéridophytes - Tardieu-Blot, Mme., (Laure) 1902 -1998 (1969)

Ptéridophytes : suivis d'une carte des localités du Gabon - Hallé, Nicolas (1964)

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Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1930)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1929)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1940)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1941)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1931)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1936)

Publication. Field Museum of Natural History. Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1938)

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Quarterly summary of re-identifications, April, May, June 1963 : Summary No. 13 - United States. Bureau of Plant Industry, (New Crops Research Branch, Plant Industry Station, 1960)

Quarterly trade catalogue of bulbs, palms, orchids, ferns, etc. : July and August 1895 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pitcher & Manda, 1895)

Quarterly trade catalogue of bulbs, palms, orchids, ferns, etc. : July, August, September, 1894 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pitcher and Manda, 1894)

Quarterly trade catalogue of palms, ferns, orchids, flowering plants, stove plants, hardy perennials, seeds and bulbs, etc. etc. : January, February, March, 1896 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pitcher & Manda, United States Nurseries, 1896)

Quarterly trade catalogue of palms, ferns, orchids, flowering plants, stove plants, hardy perennials, seeds and bulbs, etc. etc. : January, February, March, 1895 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pitcher & Manda, 1895)

Queensland Agricultural Journal - Queensland. Department of Agriculture; Stock. (Queensland Dept. of Primary Industries, 1920)

The Queensland flora - Bailey, Frederick Manson 1827 -1915 (Printed by H. J. Diddams & co, 1902)

The Queensland flora - Bailey, Frederick Manson 1827 -1915 (Printed by H. J. Diddams & co, 1905)

R. & J. Farquhar and Co's. catalogue, 1897 : reliable tested seeds plants, bulbs fertilizers tools, etc - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R. & J. Farquhar, 1897)

R. & J. Farquhar and Co's. catalogue,1895 : reliable tested seeds plants, bulbs fertilizers tools, &c - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R. & J. Farquhar, 1895)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2001)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2004)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2005)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2006)

Rapid biological inventories - Field Museum of Natural History. Environmental; Conservation Programs. (Field Museum, 2007)

Rare Florida flowers and fruits - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jessamine Gardens, 1897)

Rare Florida flowers and fruits - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jessamine Gardens, 1899)

Rare Florida flowers and fruits - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jessamine Gardens, 1900)

Rare Florida flowers and fruits - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jessamine Gardens, 1898)

Rare Florida flowers and fruits, 1896 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pike & Ellsworth, 1896)

Rare plants: choice flower seeds cacti and succulents - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodosia B. Shepherd Co, 1911)

Rare plants: choice flower seeds cacti and succulents - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodosia B. Shepherd Co, 1913)

Rare plants, choice flower seeds, cacti and succulents : descriptive catalogue, 1914 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Theodosia B. Shepherd Co., 1914, 1914)

Recherches sur l'origine et l'évolution des plastides chez les ptéridophytes. Contribution à l'étude de la cellule végétale - Emberger, Louis, 1897 - (Librairie Octave Doin, Gaston Doin, éditeur, 1921)

A record of plants collected in Southern Rhodesia; arramged on Engler's system - Eyles, Fred (1916)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1893)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1904)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1913)

Records of the Botanical Survey of India - Botanical Survey of India. (Office of Supt. of Govt. Print., India, 1921)

Recueil d'oeuvres - Errera, Léo Abram, 1858 -1905 (H. Lamertin, 1908)

Recueil de l'Institut botanique (Université de Bruxelles) - Institut botanique Léo Errera. (Henri Lamertin, 1902)

Reise der o¨sterreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wu¨llerstorf-Urbair. Erster Band: Sporenpflanzen, Botanischer Theil (Kaiserlich-Kniglichen Hof- und Staatsdruckerei, in Commission bei K. Gerold, 1870)

Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair - Österreichische Akademie der Wissenschaften. (Kaiserlich-Königliche Hof- und Staatsdruckerei; in Commission bei K. Gerold's Sohn, 1870)

Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair - Österreichische Akademie der Wissenschaften. (Kaiserlich-Königliche Hof- und Staatsdruckerei; in Commission bei K. Gerold's Sohn, 1864)

Reise in Ostafrika in den Jahren 1903-1905 : mit Mitteln der Hermann und Elise geb. Heckmann Wentzel-Stiftung : Wissenschaftliche Ergebnisse - Voeltzkow, Alfred, 1860 -1946 (E. Schweizerbartsche Verlagsbuchhandlung, 1917)

Reisen in Britisch-Guiana in den Jahren 1840-1844 : nebst einer Fauna und Flora Guiana's nach Vorlagen von Johannes Müller, Ehrenberg, Erichson, Klotzsch, Troschel, Cabanis und Andern - Ehrenberg, Christian Gottfried, 1795 -1876 (J. J. Weber, 1847)

Reisen in Ost Afrika in 1859-61. Band III : Abteilung 3 Botanik - Decken, Karl Klaus von der, freiherr, 1833 -1865 ([s.n.], 1879)

Reliable seeds : plants, bulbs, fertilizers, tools, etc - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (R. & J. Farquhar & Co, 1898)

Preliminary list of chrysanthemums and other novelties for 1904 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Nathan Smith & Son, 1904)

Rendiconti - Reale Accademia dei Lincei (l'Accademia, 1887)

Répertoire des noms génériques mentionnés dans l'Index kewensis et ses quinze premiers suppléments = Guide to the generic names appearing in the Index Kewensis and its fifteen supplements = Repertorio de los nombres genericos enumerados en el Index Kewensis y sus quince suplementos = Repertorium der im Index Kewensis und seinen fuenfzehn ersten Supplementen erwaehnten Gattungsnamen - Rouleau, Ernest 1916 -1991 (Châtelain, 1981)

Repertorium annuum literaturae botanicae periodicae - Bemmelen, J. A. van. (Erven Loosjes, 1873)

Repertorium specierum novarum regni vegetabilis (Selbstverlag des Herausgebers, 1908)

Repertorium specierum novarum regni vegetabilis. Beihefte (Verlag des Repertoriums, 1922)

Report - New York (State). Board of General Managers of the Exhibit of the State of New York at the World's Columbian Exposition. (J. B. Lyon, 1894)

Report for the year ... - Colonial Herbarium (Durban, South Africa). (Colonial Herbarium, 1897)

Report of the British Association for the Advancement of Science - British Association for the Advancement of Science. (1927)

Report on the progress and condition of the U.S. National Museum for the year ending June 30 ... - United States National Museum (G.P.O, 1922)

Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873-76 under the command of Captain George S. Nares ... and the late Captain Frank Tourle Thomson, R.N - Thomson, C. Wyville, Sir, (Charles Wyville), 1830 -1882 (Neill, 1885)

Reports of the Survey. Botanical series - Geological; Natural History Survey of Minnesota. (1892)

Retail catalogue and buyers' guide. Season 1918 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rush Park Seed Co, 1918)

Retail catalogue and planters' guide. 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rush Park Seed Co, 1919)

Retail catalogue and planters' guide : 1920 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Rush Park Seed Co, 1920)

Retail catalogue : cacti, succulents, house plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Shoreline Nurseries Inc, 1956)

Retail price list, 1937 : shrubs, trees, vines, palms, ferns, bedding plants, flowering plants and garden supplies - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Edward H. Rust, 1937)

Return / British Museum - British Museum (Natural History) (British Museum, 1906)

Return / British Museum - British Museum (Natural History) (British Museum, 1911)

Reuter's. seeds for the south. Spring 1919 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Chris. Reuter, 1919)

Revised and reduced price list of bulbs, ferns, palms, &c. : Nov. 1907 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (F.R. Pierson Company, 1907)

A revised catalogue of the indigenous flowering plants and ferns of Ceylon - Willis, J. C. (John Christopher), 1868 -1958 (H.C. Cottle, Govt. Printer, 1911)

Revised list of the Ferns of Natal - Buchanan, John, 1855 -1896 (1875)

Revisio generum plantarum vascularium omnium atque cellularium multarum secundum leges nomenclaturae internationales cum enumeratione plantarum exoticarum in itinere mundi collectarum, mit erläuterungen - Kuntze, Otto, 1843 -1907 (A. Felix [etc., etc.], 1891)

Revision de plantas vasculares Filipinas :memoria elevada al Escmo. Sr. Ministro de Ultramar - Vidal y Soler, Sebastián, 1842 -1889 (Estab. tipo-litográfico de M. Perze, 1886)

Revue critique de paléozoologie et de paléophytologie (M. Cossman, 1897)

Revue des sciences naturelles (1872)

Revue générale de botanique (Libraire générale de l'enseignement, 1889)

Revue générale de botanique (Libraire générale de l'enseignement, 1905)

Revue générale de botanique (Libraire générale de l'enseignement, 1907)

Revue générale de botanique (Libraire générale de l'enseignement, 1915)

Revue horticole (Librairie agricole de la maison rustique, 1867)

Revue horticole (Librairie agricole de la maison rustique, 1878)

Revue horticole (Librairie agricole de la maison rustique, 1885)

Revue horticole (Librairie agricole de la maison rustique, 1888)

Revue horticole (Librairie agricole de la maison rustique, 1891)

Revue horticole (Librairie agricole de la maison rustique, 1892)

Revue horticole (Librairie agricole de la maison rustique, 1899)

Revue horticole (Librairie agricole de la maison rustique, 1900)

Revue horticole (Librairie agricole de la maison rustique, 1901)